US1695387A

US1695387A - Stopping mechanism fob knitting machines

Info

Publication number: US1695387A
Authority: US
Publication date: 1928-12-18
Anticipated expiration: 1945-12-18

Description

f'De 18, 1928.

' J. REGAN STOPPING MECHANISM FOR KNITTING MACHINES Filed July 27, 1925 2 Sheets-Sheet 1 mmmu Dec. 18, 1928.

1,695,387 J. REGAN STOPPING MECHANISM FOR KNITTING MACHINES Filed July 27, 1925 2 Sheets-Sheet 2 J0 fif Z5 Patented Dec. 18, 1928.

UNITED STATES PATENTOFFHCEQ JOHN REGAN, on NEW 'nnnronn, MASSACHUSETTS, AsSienoaTo' CROMP'ION & KnewLEs LOOM worms, or VIGBCESTEB, MASsAonusETTs, A coa-ronATron or MASSACHUSETTS.

STOPPING MECHANISM FOR KNITTING MACHINES.

Application filed July 27, 1925. Serial No. 46,218.

This invention relates to a stopping mechanism for a knitting machine and particularly to mechanism for preventing the machine from turning backward.

It has been found that a knitting machine when Stopped automatically frequently turns backward a sufficient amount to unthread certain of the hooks. This backward movement may be occasioned by different causes such as the relative positions of certain unbalanced parts of the machine at the instant of stopping.

After the machine has stopped and turned backward to an extent, sufficient to unthread any of the hooks, a serious defect is caused in the fabric when the machine is again started in operation.

It is the object of my invention to provide mechanism for automatically stopping a knitting machine and for preventing backward movement of the machine when thus stopped.

My invention further relates to arrangement and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of the invention is shown in the drawings in which Fig. 1 is an end elevation of parts of a knitting machine embodying my invention;

Fig. 2 is a detail sectional plan view, taken along the line 22 in Fig. 1;

Fig. 3 is a partial front elevation, looking in the direction of the arrow 3 in Fig. 1;

Fig. 4 is a sectional side elevation, taken along the line 44 in Fig. 3;

Figs. 5 and 6 are views similar to Fig. 3 but1 showing the parts in different positions; anc

Figs. 7 and 8 are views similarto Fig. 4 and taken along the lines 77 and 88 in Figs. 5 and 6 respectively.

Referring particularly to Fig. 1, I have shown portions of a knitting machine comprising a frame 10, yarn rolls 11, tension or Whip rolls 12 and knitting mechanism indicated generally by the letter M. The machine is provided with a pair of bottom shafts 13 and 14 connected by

gears

15 and 16 and driven by a pinion 17 meshing with the gear 15 on the shaft 13. The pinion 17 is mounted upon a drive shaft 18 and the rotation thereof is controlled through connections (not shown) from a shipper rod 20. The rod 20 is slidable in

bearings

21 and 22 on the frame 10 and is provided with a fork 23 engaged by an arm 24 (Fig. 2) which may be swung manually by a handle (not shown).

The parts thus far described are of the usual type and in themselves form no part of my present invention. Acam 25 (Figs. 3 and 4) on the shaft 18 acts through a lever 26 and link 27 (Fig. 1) to actuate the stop motion which is fully described and claimed in my prior application, Serial No. 572,208, filed November 25, 1924.

For the purposes of this application it is sufficient to state that an arm 30 shown in dotted lines in Fig. 1' is swung upward whenever the Stop motion acts to bring the ma chine to rest. This arm 30 is connected by a link 31 to a latch 32 which engages a collar 33 (Fig. 3) which forms apart of a sleeve 34 which is slidable on the rod 20 and which supports a coil spring 35 interposed between the collar 33 and the machine frame 10.

The outer face of the collar 33 engages a collar 36 fast to the shipper rod 20 and provided with an offset and downwardly inclined finger 37. The collar 36 is preferably cut away as indicated at 38 (Fig. 6) to clear the latch 32. Y

A ratchet wheel 40 is fixed on the shaft 18 and is engaged by a pair of

holding pawls

41 and 42. The pawl 41 is provided with a rod 43 which is bent rearwardly to form a hook which engages the finger 37 as indicated in Figs. 3 and 4.

The pawl 42 is provided with a flange or projection 45 overlying a portion of the pawl 41 so that when the pawl 41 is raised it will carry with it the pawl 42. The

pawls

41 and 42 are of such lengths that they form a half-tooth spacing for the teeth of the ratchet wheel 40. The latch 32 is pivoted upon a fixed bracket 46 secured to the frame 10.

The normal running position of the parts is as shown in Figs. 3 and 4, with the latch 32 engaging and holding the collar 33, and with the spring 35 in compression. The shipper rod 20 is in its right hand or running position and the finger 37 on the collar 36 projects under the hook 43 and holds the

pawls

41 and 42 in raised or inoperative position as clearly shown in Fig. 4.

In Figs. 5 and 7 I have indicated the re lation of the parts when the machine is stopped hy hand. In this case the shipper rod 20 is moved to the left, sliding freelythrough the collar 33 in the sleeve 3% which parts are retained in their normal position by the latch 32, This movement of'tlie shipper rod, however, carries the collar 36 to the left, thus withdrawing the finger 37 sufliciently to permit the pawls 4H and 4&2 to engage the ratchet wheels 40 and prevent backward movement of the shaft 18.

In Figs/(Sand 8, I have indicated the operation when the machine is stopped automatically. In this case the arm (Fig. 1) swung'upward, acting through the link 31 toraise the latch 32 and release the collar The spring 35 then acts to force the collar to the left, carrying with it the collar 36 on the shipper rod 20 and thus again withdrawing the finger 37 and per mitting the pawls 4-1 and 1-2 to engage and hold the ratchet wheel'tO.

I have thus provided exceedingly simple mechanism by whichv the knitting machine will he held from backwardmovement when the machine is stopped either manually or automatically, and at the same time ll avoid excessive wear of the pawls by holding them out of operation during the normal running of the machine.

Having thus described my invention and the advantages thereof, I do not Wish to be limited to the'details herein" disclosed, othcrwise than as set forth in the claims, but what I claim is 2- 1. In a knitting machine, a reverse looking mechanism comprising a normallyinoperative holding device, andmeans to render said holding device operative to prevent rearward movement of the machine as said machine is about to he stopped, said holding device comprising a ratchet wheel, a holding pawl, a sliding rod, a pawl-controllingfinger mounted on said rod a springprcssedactuating device for said slidingmod; and automatically controlled'means for holding and releasingsaid actuating device.

2. In a knitting machine, a reverse lockmechanismcomprising a normally inoperative holdingidevice, and means-to render said holding device operative to prevent rearwardmovement ot the machine as said machine is about to he stopped, said holding device comprising a ratchet wheel, a holding pawl, a sliding rod, a finger mounted'on said rod and normally holdingsaid pawl in raised inoperative position, a spr ing pressed actuating device for said sliding fed, a latch for said actuating device, and a connection through which said latch is raised as said machine is about to be stoppedautomatically.

In testimony whereof I have hereunto atfixed my signature.

JOHN REGAN.